Portable steam generator



FIG. 1 is a perspective view of the front and one side of a portable steam generator showing my new design;

FIG. 2 is a perspective view of the top, rear and a portion of the bottom thereof; and,

FIG. 3 is a side view of said one side, the opposite side being a mirror image thereof.

The surfaces or portions of the article not shown in the drawing or described in the specification form no part of the claimed design. 

The ornamental design for a portable steam generator, as shown and described. 